Widmannstätten (Moon)

Aloys Joseph Beck Edler von; German physicist (1754-1849). (Spelling changed from Widmanstätten.)

Widmannstätten is a lunar crater in the southern part of the Mare Smythii, near the eastern limb. There is also a gap in the northern rim where the crater floor is joined to the adjacent lunar mare. The dark interior floor of this formation has been flooded by lava, leaving a level interior surface and a shallow surviving rim. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.